Linux C Program (both)

1. String constant double quotation mark "": Eg: "China", when the string is stored, it will be the end flag with a.
2. Symbolic constants, give the constants a name.

1#include <stdio.h>2 #definePI 3.1415926//Symbolic constant Pi3 intMain () {4     floatR =2.56;5     floatl, S;6         7L =2*pi*R;8s = pi*r*R;9printf"L =%f \ n", L);Tenprintf"s =%f \ n", s); One     return 0; A}

3. Operators and expressions

1 // pointer operator *,& 2 // Subscript operator [] 3 // component operator .,-> 4 // Bitwise operators >>,<<,~,|,^,& 5 6 // type inconsistency: Short and char are automatically converted to int, float is automatically converted to double, and if all float is converted back to float

Question: 100+ ' A '-60.25
Operation process: ' A ' is converted to int 65, with float-60.25,100 and 65 converted to double operation 100.0+65.0-60.25 finally converted back to float

Linux C Program (both)